#while中嵌入while进行表示
i=1
while i <= 5:
    print("上班星期为;",i)
    i = i+1
    t = 9
    while t<=17:
        print("时间段：",t)
        t=t+1


for i in range(1,6):
    print('上班为周：', i)
    for t in range(9,18):
        print('时间为段：', t, end=" ")
        print()


#九九乘法表
i=1
while i<10:
    j=1
    while j<=i:
        print("%d*%d=%d"%(j,i,j*i),end= ' ')
        j+=1
    print("")
    i+=1

# while中使用break跳出循环
i = 0
while i <= 5:
    i += 1  # i = i +1
    print('星期为：', i)
    if i == 3:
        break

i = 0
while i <= 5:
    if i == 3:
        break
        print('星期为：', i)
        i += 1

# for循环中使用break语句
for i in range(1, 6):
    print("星期", i)
    if i == 3:
        break

for i in range(1, 6):
    if i == 3:
        break
    print("星期", i)

# while循环中使用continue语句
i = 0
while i < 5:
    i = i + 1
    if i == 4:
        continue
    print("星期", i)

# for循环中使用continue语句
i = 0
while i < 5:
    i = i + i
    if i == 4:
        continue
    print("星期", i)

for i in range(1, 6):
    if i == 4:
        break
    print("星期", i)

a = 1
while a <= 100:
    print('今天是第%d天' % s)
a = a + 1

n = 1
sum = 0
while n <= 100:
    sum = sum + n
    n = n + 1
    # print(sum)
print(sum)

for i in 'python':
    print(i)

# while中嵌入while进行表示
i = 1
while i <= 5:
    print("上班星期为;", i)
    i = i + 1
    t = 9
    while t <= 17:
        print("时间段：", t)
        t = t + 1

for i in range(1, 6):
    print('上班为周：', i)
    for t in range(9, 18):
        print('时间为段：', t, end=" ")
        print()

# 九九乘法表
i = 1
while i < 10:
    j = 1
    while j <= i:
        print("%d*%d=%d" % (j, i, j * i), end=' ')
        j += 1
    print("")
    i += 1

# 闰年
score = eval(input("请输入:"))
if score % 4 == 0 and score % 100 != 0 or score % 400 == 0:
    print("是闰年")
else:
    print("不是闰年")

score = eval(input("请输入成绩分数："))
if 60 <= score:
    print("成绩已合格")
    if 90 <= score <= 100:
        print("成绩很好")

a = 50
if a > 20:
    print("变量a大于20")
else:
    print("变量a不大于20")

score = eval(input("请输入成绩分数"))
if score >= 60:
    print("成绩及格")
    if score >= 90:
        print("成绩很好")
    else:
        print("成绩一般")

score = eval(input("请输入成绩分数"))
if score >= 60:
    print("成绩及格")
    if score >= 90:
        print("成绩很好")
    else:
        print("成绩一般")
else:
    print("成绩不及格")
    if score < 30:
        print("成绩极差")
    else:
        print("成绩较差")

score = eval(input("请输入一个成绩分数"))
if score >= 90:
    print("成绩优秀")
elif score >= 80:
    print("成绩良好")
elif score >= 70:
    print("成绩中等")
elif score >= 60:
    print("成绩较好")
else:
    print("成绩不及格")

a = 1
# while a <= 100:
#   print('今天是第%d天' % s)
#  a = a + 1


n = 1
sum = 0
while n <= 100:
    sum = sum + n
    n = n + 1
    # print(sum)
print(sum)

for i in 'python':
    print(i)
